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0e1f616
(Get the code!)
You guys should be happy your system still boots. I just got that error (diskfilter writes are not supported) but grub exists immediately after, leaving my uefi with no other choice than booting another distro.
I had to spam press the pause key on my keyboard to get the error message before it disappears.
On my setup, the boot error occurs with openSuse installed on LVM2. The other distro is installed with a regular /boot (ext4) separate partition. Both are using grub. I could load both by calling their respective grubx64.efi from the ESP partition.
The last thing I remember having done on openSuse was to create a btrfs partition and tweaked /etc/fstab a little bit.
From the other distro, I can read openSuse's files and everything looks fine. It's like the boot loader used to work and suddenly failed.
I'd love to remember what else I did since it worked. And I'd love to be able to boot openSuse again.